You can register your Stocard account in your Stocard settings under "Account".
Please choose to "Register account" and select one of the available login methods (Facebook, Google, Email or Sign in with Apple). Simply select the login method you prefer. In case you choose to "Register with Email", please make sure to enter a valid address. You will receive a verification code to the mail address you entered. Please enter this code in Stocard in order to verify your mail address so that it can be used for the account registration.
As soon as Stocard displays your account as "Registered", all cards on this device are automatically synchronized with your personal cloud account and can be accessed from all of your devices, simply by logging in again.